root/ext/zip/lib/zip_set_name.c

DEFINITIONS

1. _zip_set_name

   1 /*
   2   zip_set_name.c -- rename helper function
   3   Copyright (C) 1999-2015 Dieter Baron and Thomas Klausner
   4 
   5   This file is part of libzip, a library to manipulate ZIP archives.
   6   The authors can be contacted at <libzip@nih.at>
   7 
   8   Redistribution and use in source and binary forms, with or without
   9   modification, are permitted provided that the following conditions
  10   are met:
  11   1. Redistributions of source code must retain the above copyright
  12      notice, this list of conditions and the following disclaimer.
  13   2. Redistributions in binary form must reproduce the above copyright
  14      notice, this list of conditions and the following disclaimer in
  15      the documentation and/or other materials provided with the
  16      distribution.
  17   3. The names of the authors may not be used to endorse or promote
  18      products derived from this software without specific prior
  19      written permission.
  20  
  21   THIS SOFTWARE IS PROVIDED BY THE AUTHORS ``AS IS'' AND ANY EXPRESS
  22   OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  23   WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  24   ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY
  25   DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  26   DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
  27   GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
  28   INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER
  29   IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
  30   OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
  31   IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  32 */
  33 
  34 
  35 #include <stdlib.h>
  36 #include <string.h>
  37 
  38 #include "zipint.h"
  39 
  40 
  41 int
  42 _zip_set_name(zip_t *za, zip_uint64_t idx, const char *name, zip_flags_t flags)
  43 {
  44     zip_entry_t *e;
  45     zip_string_t *str;
  46     bool same_as_orig;
  47     zip_int64_t i;
  48     const zip_uint8_t *old_name, *new_name;
  49     zip_string_t *old_str;
  50 
  51     if (idx >= za->nentry) {
  52         zip_error_set(&za->error, ZIP_ER_INVAL, 0);
  53         return -1;
  54     }
  55 
  56     if (ZIP_IS_RDONLY(za)) {
  57         zip_error_set(&za->error, ZIP_ER_RDONLY, 0);
  58         return -1;
  59     }
  60 
  61     if (name && name[0] != '\0') {
  62         /* TODO: check for string too long */
  63         if ((str=_zip_string_new((const zip_uint8_t *)name, (zip_uint16_t)strlen(name), flags, &za->error)) == NULL)
  64             return -1;
  65         if ((flags & ZIP_FL_ENCODING_ALL) == ZIP_FL_ENC_GUESS && _zip_guess_encoding(str, ZIP_ENCODING_UNKNOWN) == ZIP_ENCODING_UTF8_GUESSED)
  66             str->encoding = ZIP_ENCODING_UTF8_KNOWN;
  67     }
  68     else
  69         str = NULL;
  70 
  71     /* TODO: encoding flags needed for CP437? */
  72     if ((i=_zip_name_locate(za, name, 0, NULL)) >= 0 && (zip_uint64_t)i != idx) {
  73         _zip_string_free(str);
  74         zip_error_set(&za->error, ZIP_ER_EXISTS, 0);
  75         return -1;
  76     }
  77 
  78     /* no effective name change */
  79     if (i>=0 && (zip_uint64_t)i == idx) {
  80         _zip_string_free(str);
  81         return 0;
  82     }
  83 
  84     e = za->entry+idx;
  85 
  86     if (e->orig)
  87         same_as_orig = _zip_string_equal(e->orig->filename, str);
  88     else
  89         same_as_orig = false;
  90 
  91     if (!same_as_orig && e->changes == NULL) {
  92         if ((e->changes=_zip_dirent_clone(e->orig)) == NULL) {
  93             zip_error_set(&za->error, ZIP_ER_MEMORY, 0);
  94             _zip_string_free(str);
  95             return -1;
  96         }
  97     }
  98 
  99     if ((new_name = _zip_string_get(same_as_orig ? e->orig->filename : str, NULL, 0, &za->error)) == NULL) {
 100         _zip_string_free(str);
 101         return -1;
 102     }
 103 
 104     if (e->changes) {
 105         old_str = e->changes->filename;
 106     }
 107     else if (e->orig) {
 108         old_str = e->orig->filename;
 109     }
 110     else {
 111         old_str = NULL;
 112     }
 113     
 114     if (old_str) {
 115         if ((old_name = _zip_string_get(old_str, NULL, 0, &za->error)) == NULL) {
 116             _zip_string_free(str);
 117             return -1;
 118         }
 119     }
 120     else {
 121         old_name = NULL;
 122     }
 123 
 124     if (_zip_hash_add(za->names, new_name, idx, 0, &za->error) == false) {
 125         _zip_string_free(str);
 126         return -1;
 127     }
 128     if (old_name) {
 129         _zip_hash_delete(za->names, old_name, NULL);
 130     }
 131 
 132     if (same_as_orig) {
 133         if (e->changes) {
 134             if (e->changes->changed & ZIP_DIRENT_FILENAME) {
 135                 _zip_string_free(e->changes->filename);
 136                 e->changes->changed &= ~ZIP_DIRENT_FILENAME;
 137                 if (e->changes->changed == 0) {
 138                     _zip_dirent_free(e->changes);
 139                     e->changes = NULL;
 140                 }
 141                 else {
 142                     /* TODO: what if not cloned? can that happen? */
 143                     e->changes->filename = e->orig->filename;
 144                 }
 145             }
 146         }
 147         _zip_string_free(str);
 148     }
 149     else {
 150         if (e->changes->changed & ZIP_DIRENT_FILENAME) {
 151             _zip_string_free(e->changes->filename);
 152         }
 153         e->changes->changed |= ZIP_DIRENT_FILENAME;
 154         e->changes->filename = str;
 155     }
 156 
 157     return 0;
 158 }